名词
中文翻译：信号
同义词：
['flag', 'flagpole', 'banner', 'flagstaff', 'flagman', 'signalman', 'flag-bearer']
例句：
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1. The policeman used his whistle to signal the traffic to stop.
警察用他的哨子来示意交通停止。
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2.The flags fluttered in the wind as the parade began.
随着游行的开始，旗帜在风中飘扬。
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3.The signal was clear; the ship could proceed.
信号明确；船只可以继续前进。